atari 1450xld

I used to own one of the engineering prototypes (#5) that had a TONG version of the motherboard. Before I sold it, to a very good friend for his collection hobby, I did make copies of the ROMs. The machine I had the following items:

• Used a SSI-263 chip for the Voice Synthesizer. This is similar to the Votrax SC-02 second generation voice chips. I have a copy of a article from Byte Magazine that goes into the SSI-263 chip and builds a voice synthesizer for the Apple II. I'm not quite sure if Brad still has some, but I think Best Electronics might carry them. If not, JDR Microdevices was the other place I found to carry them. I believe the SSI-263 was made by Silicon Systems.
• Had a 300 baud modem and used a Intel chip for the RS232 function. I don't remember exactly what chip it was.
• Had two Epson made double-sided, double-density disk drives. Both drives worked. They were mounted in the case and had a piece of sheet metal molded into a bracket and attached to the case to support the drives. Atari engineers had drilled holes into the side of the case and had screw threads poking out that were holding the bracket in place. I was able to get Atari DOS 2.0, 2.5, 3.0, and 4.0 to load on the machine, but SpartaDOS would not load. The reason is that SpartaDOS uses it's own D: driver and would overwrite the device handler address info and use it's own D: driver.
• The voice synthesizer didn't work on this machine. I don't know if the SSI-263 chip was bad or if the two prototype 40 pin chips were bad. These two chips I was told were language chips. What their exact purpose was I don't know. They were definitely prototype because someone used some scotch tape to put the gold cover on the chip package when they mounted the chip in the chip package.
• There was a small breadboarding area on the board for the engineers to add any additional circuits.
• There was a area for a 48 pin chip. This spot I was told was for a possible Apple II emulation. But haven't seen any info to prove that.

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